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I'm new to node.js
I have plan to use database other than MySQL (lets say MongoDB), but I'm only familiar with MySQL.
Do you think better to use MySQL first and change to MongoDB in the future? or learn MongoDB quickly and use MongoDB from beginning?
If you know how to appropriately use MySQL, then use it.
If you want to learn about MongoDB (or any other thing), then find some time to play with it on toy systems, just as you did when learning MySQL (or any other thing).
If, after having reasonable experience with both things, you think MongoDB has a place in your system, then use it. Either replacing or complementing whatever you already have.
But don't do it just because it's the cool thing to do.
First of all, you have to wonder why you want to use a NoSQL database. Is it because it's easier to develop for your application ? More efficient ? Scales better ? because of the hype ?
Then, if you think MongoDB is a good choice, go ahead with it. Implementing a first solution in SQL, then switching, looks like a waste of time to me (you will have to change a lot of your design).
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I am curios why some prefer MYSQL over SQLITE, i am interested on learning MYSQL
SQLite is an embedded library, it requires no server process, and everything it saves is contained within a single, portable file. MySQL is an RDBMS server that's a lot more work to set up, but is multi-user, more scalable, and far more featured.
For example, SQLite is used for mobile applications as well as "development" instances of code where it's only lightly loaded. It can be used at scale but generally isn't, its simple design has limitations.
If you're writing a mobile application and need a local database, SQLite is not a bad call. Spinning up a huge, cumbersome MySQL process to do the same thing on a mobile device is a bad plan.
Although they're both "SQL databases" and have a lot of functional overlap, they're engineered to solve some very different problems. In some trivial use cases it might be an arbitrary choice as to which is best, but in most cases it's pretty obvious which of the two you need.
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In absolute terms, Postgres has more features and has been used at scale by Instagram, etc. while MySQL has a much bigger user base and has been used at scale by likes of Facebook, Quora, etc. But how about in combination with NodeJS?
Which is more popular with NodeJS?
MySQL is probably more popular, solely in terms of userbase. (You sorta answered this yourself)
MySQL probably has more examples around the net which could help make things easier to set up. You'll probably also find MySQL more likely to come preloaded on a VPS if that's the sort of route you're taking. However setting up PostgreSQL on your server is not difficult, and there is plenty of documentation available.
It really depends on what your intentions are with your data. Digital Ocean wrote a nice concise comparison of MySQL and PostgreSQL found here
As far as how these play with node.js, in my experience the node modules for PostgreSQL and MySQL are equally pleasant to work with. Ultimately its more about picking the database that suits your data and what you want to do with your data. Then deciding how it fits into your node stack.
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Please read before you answer: I don't need any opinion-based answers or "nosql vs sql which is better" debates on the subject, just facts.
I want to slowly convert a php+mysql website I wrote with Symfony2 into a real time application using backbone with nodeJs + websockets.
I want to make a slow transition by changing single features, since I don't want to break a fully functional site.
I have been educating myself about NodeJs by reading books and watching Tutorials and there is one thing I noticed, I own more than 5 nodeJs books and none of them use MySql although its fully supported by node.
They all use MongoDB.
Here is my situation
1. My Website is already integrated into MySql(Doctrine)
2. My MySQL setup is fully functional and needs no improvements so far
I'm really frustated and I have a few questions:
Why is MySql not prefered although its a more mature piece of technology?
What are the advantages of moving to MongoDB over MySQL for the purpose of having a real-time application??
I've seen people choose Node/Mongo development because of the simplicity of the all-JavaScript stack, I've seen people choose Mongo because it's the New Hotness, and I've seen people choose Mongo because it's actually the right tool for the job: they have a large amount of document-like, unstructured data and/or they want to take advantage of Mongo's support for horizontal scaling, among other differences between MySQL and Mongo.
I'm not sure it's possible to answer this question in a non-opinion-based manner and without touching on Sql vs NoSql. Mongo is simply a tool, and it happens to be free and commonly used in the field with Node. If I were writing a Node tutorial, I'd probably choose Mongo too, because it's common and it's cool.
If Mongo is the right tool for your site's use cases, then the transition is probably worth it. If MySQL is the right tool for your site, then congratulations! You've just saved a bunch of time rewriting your DB in Mongo.
As an aside- if your question uses the word "preferred", I can't really think of a way for it to not be opinion-based, by definition.
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I've been developing a small database for my summer internship and I need to write a manual/documentation for it aimed at both users and developers for future use. Thing is...I have no idea where to start or what information to include. Many people I work with have no idea what databases can do so I need to keep it as simple as possible. The database is implemented in Access and I experimented with the database documenter but I think that is overkill. Is there some kind of documentation standard that I can follow or anything of that nature?
As a starter for ten, I'd have thought that the user documentation should be task orientated.
(i.e: How to achieve 'X'.)
In terms of the developer documentation, defining the meaning of any non-obvious fields in your schemas, how they're used and the relationships between different tables, etc. would be a good start. (I'm presuming your VBA code is well commented, etc.) You may also want to examine the existing "Documenting Visual Basic with Doxygen" question/answer.
Just straightforward english if you are explaining a process.
If you have a series of Macros do a document highlighting to code used in each macro and the order it should be employed. This could aid someone down the line if they are trying to automate the process.
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as google isn't really helpful here:
what's the best way of migrating a mongodb database to a mysql database? any best practise examples?
thanks!
After you have completed scarpacci's exercise and have an idea of the mappings, I would then look at mongoexport - you should be careful about type fidelity though and then you will have to import the CSV/TSV into MySQL in a sane manner also.
The other option, especially if you run into typing issues, is to simply pull all of your data out programmatically using your language and driver of choice and insert it directly into MySQL, again using your favorite driver - this gives the most control, but is also the most work.
This might be a bit of a non-starter, because people usually implement things in Mongo or other NoSQL databases in order to have a schemaless design. That is diametrically opposed to the concept of a relational database.
Without looking at the sort of data structures you have in Mongo, this would be impossible to answer.
#Tronic I would start by utilizing the mappings MongoDB provides on their site:
Mapping Guide
I would then try and take your documents in each of your collections and try to break those out into the proper DB Entities (Tables). The entities / attributes could be difficult to design based on the schemaless design of Mongo (As #Mike Brant indicates)
Hope this helps.
--S